[PATCH 3/3]posix acl:Add an acl check

From: Liuweni
Date: Thu Dec 17 2009 - 09:23:24 EST

In this function, the parameter of acl will be called by FOREACH_ACL_ENTRY(macro)
without null point check. I add a Null point check to it.

Signed-off-by: Liuwenyi <qingshenlwy@xxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: linux-fsdevel@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 39df95a..6d81a13 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -213,6 +213,9 @@ posix_acl_permission(struct inode *inode, const struct posix_acl *acl, int want)
const struct posix_acl_entry *pa, *pe, *mask_obj;
int found = 0;

+ if (!acl)
+ return -EINVAL;
FOREACH_ACL_ENTRY(pa, acl, pe) {
switch(pa->e_tag) {

Best Regards,

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